Buffer



Aug. 9, 1927.

o. E. BERGENDAHL ET AL BUFFER I Filed June 25, 1926 2 Sheets-Sheet 1 L 5 M... 7 3 Y ma m W BM M B 50 2; Y B

Aug. 9, 1927. 8,008

, O. E. BERGENDAHL ET AL BUFFER I Filed June 25, 1926 2 Sheets-Sheet 2 INVENTORS OscArz E. QEQGENDAHL 2055215 A. RIMEL HEIP. A-rm ZNEY J Patented Aug. 9, 1927.

' v UNITED STATES PATENT orrlce.

OSCAR E. BERGENDAHE AND ROBERT A. RIMEL, OF ERVIIN, TENNESSEE, ASSIGNORS OI ONE-THIRD TO WILLIAM S. MOSELEY, .OF ERWIN, TENNESSEE.

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Application filed June 25, 1926. Serial No. 118,485.

Our invention relates to buflers for railway locomotives. partici'llarly to railway locomotives of the Mallet articulated type.

In the operation of railwav locomotives of the Mallet articulated type, in which the two engines thereof are connected by means ofa hinge connection. the wear of the pins or pin holes of the hinge-connection produces a slack movement and tends to make the locomotive ride roughly. So pronounced is the uneven running of the locomotive when there is excessive wear of the pins or pin holes of the hinge connection, that considerable time and expense is necessary to keep the slack movement at a minimum by frequent renewals of the pins and by bushing the pin holes.

The object of our invention is to provide means to cushion the movement of one engine towards the other caused by wear in the hinge connection between the two engines.

Another object is to provide cushioning means between the two engines which will permit even and smooth running of the locomotive even when the pins and pin holes of the hinge connection are worn and distorted.

Other objects are to provide cushionin -means between the two engines of simple design, readily accessible for inspection and replacement and in general to provide such advantages and desirable features as will appear from the following description In the accompanying drawings illustrating our invention, Figure 1 is a diagrammatic plan view of the hinge connectionbetween the two engines of a Mallet articulated locomotive with our improved buffer associated therewith.

Figure 2 is a diagrammatic elevational view of the same.

Figure 3 is a side elevational view of the buffer shoe, Figure 4 a plan view and Figure 5 an end elevational view of the same.

Figure 6 isa perspective view of the dowel pin employed between'the buffer spring andv the buffer spring seat. 7

Figure 7 is a perspective view of the bufi'er spring seat.

Referring to the drawings, 1 represents the cylinders of the high pressure or trailing engine and 2 the frames of the low pressure or leading engine. The "frame crosstie 3 is rigidly secured to the frames 2. The hinge connection 4 has horizontally disposed pivot pins 5 securing it to the low pressure engine, and a vertically disposed pivot pin 6 securing it to the high pressure engine. These pivotal connections permit vertical and horizontal angling respectively of one engine with re- Q spect to the other engine, which angling'is necessary due to the vertical and horizontal curvature and unevenness of the-track.

As wear develops in the pins 5 and the pin 6 and. the holes in which theyare disposed,

there will be slack movement of the hinge connection 4 relative to the two engines and also movement of one engine relative to the other. The tendency of the two engines, un-

. dcr certain frequent occurring conditions, to

operate at different rates of speeds causes excessive stresses and strains to be set up in the hinge connection 4 when there is wear of the pins 5 and 6 or the holes in which they are disposed. Slack movement of the hinge connection 4 also causes uneven or rough operation of the two engines.

In order to cushion the horizontal movement of one engine relative to the other we have provided a buffer. consisting of the 30 spring 7 bufler shoes 8 and vbuffer spring seat 9, disposed between the two engines. The buffer shoes 8, which are. shown in detail in Figures 3, 4, and 5, have a wearing or rubbing member 10 disposed between the 95 ends of the spring 7 and frames 2. Horizontally disposed flanges 11 position the ends of the spring 7 vertically. Other horizontally disposed flanges 12 straddle a rib 13 of the crosstie 3, thus securing the shoes vertically and against outward movement of same. At one end of the shoes 8 a vertically disposed flange 14 fits around the end of the frame 2, securing the shoes against inward movement. An opening 15 is provided'in the upper flange 11 for the purpose of applying lubricant between the end of the spring 7 and the wearing face of the member 10.

- other parts of and 6 and the holes in which Thus the shoes 8 are held securely in place by spring 7 which is under compression when the two engines are in a normal position relative to each other. The amount of the compression of the spring 7 is greater than the wear permissible in the pins 5 and 6 before their renewal.

The ends of the spring vertically by means of the flanges 11 but are free to move transversely when the locomotive is on a curve.

Disposed between the spring 7 and the high pressure engine is the spring seat 9, shown in detail in Figure 7. The spring seat 9 is bifurcated at 16 to engage a rib on the cylinders of the high pressure engine. The dowel, 17, shown in detail in Figure 6, fits into the opening 11.8 of the spring seat 9 and into a depression in the band of the spring 7 The rib of the high pressure eylinder which the spring seat 9 engages is notched as shown at 19 to prevent transverse movement of the seat 9 relative to the cylinder. Vvhile the spring seat 9 is shown as engaging a rib on the high pressure cylinders, it will be readily understood that on account of the construction of the engine, the seat may be made to engage any' convenient fixed part of the high pressure engine such as the cylinder saddle, draw hinge fulcrum or frame erosstie. Theseat 9 and the shoes 8 by their construction and engagement with the locomotive are held in a fixed position transversely and vertically and are also held in a fixed longitudinal posit-ion by the compression of the spring 7.

The spring 7 is applied under compression when the pins 5 and 6 and the holes in which they are disposed are true and not worn. As wear develops in the pins and the holes the spring 7 will tend to force the two engines apart and any movement of one engine towards the other engine will be cushioned by the spring 7 It will be readily seen that with this cushioning device the permissible amount of wear of thepins 5 they are disposed is greatly increased.

Thus we have provided a buffer which cushions the movement of' one engine towards the other, thereby permitting an even and smooth running of the locomotive. Our invention consists of few parts of simple design, readily assembled and accessible for inspection and replacement.

It is obvious that many changes may be made in the buffer which we have shown anddescribed herein to suit different types of hinge connections, without. departing from our invention.

What we claim is 1. In a locomotive of the Mallet articulated type, means disposed between the two engines thereof to cushion the movement of toward the other engine, said one engine 7 are positioned the ends of said spring and engines thereof means consisting of a horizontally disposed spring engaging the cylinders of one engine and the frames of the other engine.

2. In a locomotive of the Mallet articulated type, means disposed between the two engines thereof to cushion the movement of one engine toward the other engine, said means comprising a horizontally disposed spring engaging .a member of one engine and a member of the other engine, a removable sea t disposed between the center of said,

spring and the said member of one engine, removable shoes. disposed between the ends of said spring and the said member of the other engine.

3. In a locomotive of the Mallet articulated type, a connection between the high and the low pressure engines thereof, a spring horizontally disposed between amemher of the high pressure engine and a member of the low pressure engine. a seat disposed between the center of said spring an the said member of the high pressure engine, shoes disposed between the ends of said spring and the said member of the low pres-' sure engine.

4. In a locomotive of the Mallet articu-' lated type, means disposed between the two engines thereof to cushion the movement of one engine toward the other engine, sai means comprising a bifurcated seat engaging a depression in a member of one engine, a spring, a dowel pin disposed between said seat and said spring, shoes disposed between a member of the other engine,'the ends of said spring being free to move transversely. I

5, In a locomotive of the Mallet articulated type, means comprising a spring, spring seat, dowel pin and shoes disposed between the two engines thereof to cushion the movement of one engine toward the other engine. horizontally disposed flanges on said shoes for positioning vertically, other horizontally flanges for positioning said shoes vertically and against outward movement, a vertically disposed flange for positioning said shoes against inward movement.

6. In a Mallet articulated locomotive, a half elliptic spring disposed between the two to cushion the movement of one engine toward the other.

7. In a Mallet articulated locomotive, a half elliptic spring disposed between. the two engines thereof to cushi on the movement of one engine towardthe other engine. means for positioning the said half elliptic spring. 8. In. a Mallet articulated locomotive means disposed between the end of the frames of the low pressure engine and-the cylinder of the high pressure engine to cushion the movement of one engine toward the other engine. 9. In a Mallet articulated locomotive 1,ese,oos

spring means disposed between the end of the frames of the low pressure engine and the cylinder of the high pressure engine to cushion the movement of one engine toward 5 the other engine, additional means for positioning said s ring.

10. In a fiallet articulated locomotive spring means disposed between the front end of the frames of the high pressure engine and the back end of the frames of the low 1 pressure engine to cushion the movement of I one engine toward the other engine, additional means for positioning said spring.

OSCAR E. BERGENDAHL. ROBERT A. RIMEL. 

